what are the diferent classes of fire?

Question

what makes a
class A
class B
class C
class D
fire which extinguishers are best to use on them??

Answer 1

Rather than write a lengthy answer on this one, I want to refer you to an excellent site that I think does a fantastic job of not only identifying the classes of fire (you missed one, BTW, class K), but shows what extinguishers should be used on each.

Check it out, I think you will find everything you are looking for...

Answer 2

Class A

Class A fires involve common combustibles such as wood, paper, cloth, rubber, trash and plastics. They are common in typical commercial and home settings, but can occur anywhere these types of materials are found. Examples include: Trash, wood, paper and clothClass A Extinguishers will put out fires in ordinary combustibles, such as wood and paper. The numerical rating for this class of fire extinguisher refers to the amount of water the fire extinguisher holds and the amount of fire it will extinguish.

Class B

Class B fires involve flammable liquids’ gases, solvents, oil, gasoline, paint, lacquers, tars and other synthetic or oil-based products. Class B fires often spread rapidly and, unless properly secured, can reflash after the flames are extinguished. Examples include: Flammable liquids, gases and solvents.

Class B Extinguishers should be used on fires involving flammable liquids, such as grease, gasoline, oil, etc. The numerical rating for this class of fire extinguisher states the approximate number of square feet of a flammable liquid fire that a non-expert person can expect to extinguish.

Class C

Class C fires involve energized electrical equipment, such as wiring, controls, motors, data processing panels or appliances. They can be caused by a spark, power surge or short circuit and typically occur in locations that are difficult to reach and see. Examples include: Electrical Equipment
Class C Extinguishers are suitable for use on electrically energized fires. This class of fire extinguishers does not have a numerical rating. The presence of the letter “C” indicates that the extinguishing agent is non-conductive.

Class D

Class D fires involve combustible metals such as magnesium and sodium. Combustible metal fires are unique industrial hazards which require special dry powder agents. Examples include: Combustible Metals.
Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question. There is no picture designator for Class D extinguishers. These extinguishers generally have no rating nor are they given a multi-purpose rating for use on other types of fires.

Class K

Class K fires involve combustible cooking media such as oils and grease commonly found in commercial kitchens. The new cooking media formulations used for commercial food preparation require a special wet chemical extinguishing agent that is specially suited for extinguishing and suppressing these extremely hot fires that have the ability to reflash. Examples include: Combustible Cooking Media.

It is important to match the proper fire extinguisher to the size of the area you are protecting and the potential hazard. This is why fire extinguishers contain different agents and are listed for specific classes of fire. Many extinguishers available today can be used on different types of fires and will be labeled with more than one designator, e.g. A-B, B-C, or A-B-C. Make sure that if you have a multi-purpose extinguisher it is properly labeled

Answer 3

Class A fire = paper and wood = water to extinguish
Class B fire = Oil and gas = Carbon dioxide or dry not flammable powder to smoother the fire
Class C fire = Electrical fire = Stop the electrical source feeding the fire and use Carbon dioxied or dry poweder.
Class D fire = Nuclear fire = Get your **** out of the area.

Answer 4

Class A Extinguishers will put out fires in ordinary combustibles, such as wood and paper. The numerical rating for this class of fire extinguisher refers to the amount of water the fire extinguisher holds and the amount of fire it will extinguish.

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Class B Extinguishers should be used on fires involving flammable liquids, such as grease, gasoline, oil, etc. The numerical rating for this class of fire extinguisher states the approximate number of square feet of a flammable liquid fire that a non-expert person can expect to extinguish.

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Class C Extinguishers are suitable for use on electrically energized fires. This class of fire extinguishers does not have a numerical rating. The presence of the letter “C” indicates that the extinguishing agent is non-conductive.

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Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question. There is no picture designator for Class D extinguishers. These extinguishers generally have no rating nor are they given a multi-purpose rating for use on other types of fires.

Answer 5

the best way to remember is a class a is anything that makes ashes like paper.class b any thing that burns in barrels like gas.class c is current like electricity.class d is all of these.remember the mneumonic device P A S S pull pin aim nozzel squeeze triger sweep side to side.A B C ashes, barrel ,current D all of the above.SECTION FIREFIGHTER 1728 if you need anything eles for school or anything at all let me [e-mail]

Answer 6

convection
radiation
and ready aim

Answer 7

http://en.wikipedia.org/wiki/Classes_of_fire

Answer 8

try wikipedia.org